Hydraulic brake



June 15, 1937. H. E. DAYVOLT 2,084,295

' HYDRAULIC BRAKE Filed July 18, 1934 2 Sheets-Sheet 2 Patented June 15, 1937 UNITED STATS HYDRAULIC BRAKE Henry E. Dayvolt, Evansville, Ind., assignor of one-half to Charles F. Lautenslager, Evansville,

Ind.

Application July 18, 1934, Serial No. 735,877

4 Claims.

The object of the present invention is to provide an improved hydraulic brake embodying novel constructions and relationships of elements and a new mode of operation by which the braking action is effected through the action of a liquid, such as oil, according tothe relative position of the rotary and stationary elements without the necessity of employing brake shoes, linings, or mechanical friction surfaces such as have" hereto-fore been employed in hydraulic brakes.

The present invention utilizes the principle of rotary and stationary elements with a fluid space therebetween, means for normally maintaining the stationary and the rotary parts in substantially concentric relationship to enable free running of the rotary parts to be had, combined with means for relatively shifting the stationary and rotary parts to change their relationship 0 from that of concentricity to eccentricity by hydraulic action, together with by-pass and fluidapplying and releasing conduits or channels, and other means, whereby locking will be avoided and yet the maximum fluid pressure necessary to properly check the rotating element may-be obtained, with adaptability for automatic restoration of the rotary and non-rotary parts to normal concentric relationship when the braking pressure is let off.

The invention is susceptible of modification from the construction hereinafter described and shown in the accompanying drawings, without departing from the essential principles thereof.

The present hydraulic brake cannot become overheated, is reliable inaction and, when used with other similar hydraulic brakes on a vehicle, will operate simultaneously and equally in all of the similar brakes employed.

1 :In the accompanying drawings:

' Figure 1 is a cross section on the line I-l, of Fig. 2, the parts being in inoperative or running position;

Fig. 2 is a Vertical section on the line 22 of Fig. 1;

Fig. 3 is a detail section on the line 33, Fig. 1;

Fig. 4 is a similar view on the line 4 i, Fig. 1, showing the set screw which secures the operating block to the axle housing;

Fig. 5 is an enlarged detail section on the line 55 of Fig. 2, showing a paddle or vane and the means for its operation.

Fig. 6 is an enlarged perspective view of the paddle or vane shown in-Fig. 5; and

Fig. 7 is an enlarged perspective viewshowing the steel block which is rigidly affixed to the axle, and which is shown in detail in Figs. 3 and 4.

My invention is illustrated and will be described as a hydraulicbrake for vehicles but it will be understood that it may be put to other uses.

' The hub, web, or spokes of a vehicle wheel is shown at 5. An enclosing shell or drum 2 and a plate 3 serve as a housing for the operative parts, the rotary axle appearing at 4 and the stationary axle housing at 5. The axle 5 passes through the hub construction 5 of the wheel. The drum 2 is secured to the spokes or web I by bolts i. The plate 3 and an inner casing 8 are fastened together by bolts 9. The drum 2 and the casing 3 are secured together by interlocking lugs It, M respectively screwed to saiddrum and casing.

The rotary system thus provided comprises the web or spokes I of the wheel, the drum 2, the plate 3, and the casing 8. Ball bearings l2 are interposed between the plate 3 and casing 8 and the axle housing 5. Packing nuts l3 prevent leakage of the fluid contained within the plate 3 and'casing 8. In the construction shown it will be understood that packing i4 is held by the nuts l3.

Roller bearings !5 are interposed between the axle i and the axle housing 5. Any suitable axle nut 16 may be provided for the axle i.

Carried by the casing 8 and located between it and the drum 2, are paddle or vane housings ll having removable ends it and containing slidable paddles Iii which are normally retracted into their housings ll by contractile coil springs 29 located inside the paddles and connected to the removable ends or plates l8. Normally these 1 springs 29 hold the paddles in retracted position but permit the paddles to be projected when a braking action is desired by the pressure exerted on the paddles by oil forced through the ducts 2| in the paddles l9 as will appear hereinafter.

There is a steel block 22 which, as shown in Fig. 4 is rigidly fastened to the axle housing by a set screw 23 and keys 24 so that it is stationary. This block is provided with an internal fluid conduit 25 into which the fluid used in the brake may be forced through an oil hose 26 leading'to the nipple 26 carried by the axle housing 5 via a duct 21, as shown in Fig. 3.

The oil hose 26 which connects to the nipple 26 leads to any suitable, or usual, oil or fluidapplying system, controlled in any manner, such as by a foot pedal, whereby the oil or fluid used in the brake may he forced through the hose into the nipple 25 and intothe ducts 21 and 25 when I the brake is tobe'usedl 1 From the duct 25 the oil or; fluid may pass "into a duct28 and thence into a duct29 in the v blocln; said duct openingL ut,through'the ends of the block at 38 and 3L i The duct '28 communicates witha port'32 which i leads to a cylinder 33 in the block 22 for the pur-' pose of operating a piston 34 which is utilized' in a manner appearing hereinafter.

.The block 22 also has a by-pass duct '35 extend- V ingfrom its upper to itslowerf end.-

Disposed oppositely to the'piston 34'and mov ableina cylinderifi in the block 22 is a piston 31 fwhich is normally forced down as shown in Fig.

" will presentlyappear;

one-way relief valve 39 V20 controlling a relief passage 40 in the block 22 .1' by an expansion spring 38 for a purpose which There is provided a I which enables the oil or fluid tov escape into the 7 earing' I2 when theipiston' 3'! is forced into the f cylinder 36 in opposition ;t0 the action of spring 38, as will presently appear. f

Located within the casing 8 and plate shiftable thereinin relationto the fixed block 22,"is a core 4| which has an opening 42in which the the block is positioned. said block serving as a guide. which prevents the core from turning and yet permits it to assume a normal concentric relationship to the casing 8; as shown in Fig. 1, or an eccentric relationship there-to, as when the braking action is to be obtained- The straight edges of the block andcore at 43 by. theirsliding contact, effect the guidingfactiondescribed.

The piston 37 which isnormally heldiin the position shown-in Fig. 1 by the spring; 38, and by its contact with core 4|:at one endof the open-- ing 42. normally maintainsfthe core in concentric relationship to the casing 8, permitting a free flow of the oil or fluid in the space inas- .much as the blades or vanes I9 are normally re tracted by their springs 20. and thus do not project into the space 44'.'

cess to cylinder 33 and forces piston 34 outwardly against core-4|,'shifting the core into an eccenr 'tric relationship to'the casing 8.; The oil or fluid ,7

being under pressure, also forces, the vanes |9 into the. space 44. V The shifting of the core is j not opposed by piston 31' because any oil ortfiuid in'cylincler 36 will 'bereli'eved through ;outlet-40[- qtothe bearing |2.; The piston 31 1s positioned jwith'inthe cylinder-36 without packing-rings so 4 I that the spring 38' is sufficiently strong to force piston 3'! to the position sh'own in Figs. 51 and .2

9 its periphery-adjacent the vanes'l9 and'also into 7 theopening or space 42.

when 'pressureis released frompthe space':44. The core has two ducts 45,.46Vwhich openinto When the core' is in V the normal position shown in'Fig; 1, the port 45 V duct' 4? communicates with mouth 3|of duct .29. Operation: Normally, no braking actionexists. f thefparts then being in the positions shown in.

communicates withthe mouth 30"ofduct,29 but -when braking is being effected, the core-then bek ing in eccentric relationship to the casing- 8 the When a braking action: is desiredQ-the brake.

' pedal (notlshown) is operated, thus forcingioil,"

forthe'fluidus'ed in the particularsystem from "the master cylinder thereof into thehosejZfi,

the nipple rze and ducts 21. 25, 28,}29,.space;42

sand 7 .However, when the; brake pedal isoperated'and oil or fluid is forced into the nipple 26, it has ac-' 7 "2,084,295 V V V n an ducts 45, 46, and into space 44 The on or fluidis also forced into ducts 2| The vanes l9 are'thus forced into space 44 and against 'core 4|. 7 When the vanes I!) are against core 4|, the oil in space 44' must circulate around said core. .If

the brake pedallis then pressed further, the oil will also enter the duct 32 and pass into cylinder 33 which will result in piston 34 pressing against core 4| and shifting. said core from the position;

of Fig; 1,,where it is concentricto the casing},

to a position eccentric to. Saidcasing. 'I'hespace 42' at'the lower part of 'theopening in thecore will then decrease and a similar space will exist above theiblock 2 2. The oil space 44 isjthen-re- 'cluced in size above the core and results in check! ing the flow of the oil vbetweerilthe core and the' casing 8. 'Ifthe' core 4| isiforced clear up to the casing 8, the vehicle wheel will lockias the vanes iflrcannot rotate unless the oil canbe forced betweencore 4| and casing 8 in front of. them.

Should. the braking fluid. be applied when the paddles are in thetline '4-+-4,'Fig; 1,"as the core 4| moves upward, this would reduce the oll space 44 at the top. of the vanes and enlarge the space below the vanes and thus-the core couldnot rise unless'a part of the .oil can escape.- To provide used; As the space is; reduced-above the vanes,

the oil'passes through said ducts andintoithat part of the space 44 which lies below the vanes.

'for this contingency; .theducts 29, 45,46 are When the core 4| is elevated, reducing the space 42' below the block; 22,;the oll flows through the ducts 29 and and is received in the correspond? Y ing space then existing betweenthe top of the block 22 and the core 4|.

I V When the brake pedal is" released, thespring'w V '38 projectsthe piston 3'|.and Vforcesthe core 4| 'back to" the 'normalposition of Fig. '1. The

springs 20 also retract the vanes I9, The wheel may then turn freely; as no V 'braking'action exists. What I claim is: v

1.1In' a hydraulic "brakesthe combination a rotary;,element.j of a relatively stationary ele-. ment surrounded by therotaryelement and nor! mally separatedggtherefromi by a space adapted tocontain a' fluid; a'bloc'k' contained within the relatively stationary element; means carried: by

the block. adapted for normally maintaining the 1 stationary element in a given position in relation to the block a'nd concentric to the rotary element, andmeans carried by the block adapted to: act on the relatively'stationary element "to shift it in relation rztothe blo'ckinto eccentric relation togthe 'rotary element,ffor braking-pur 5.

DOSES. 4

2. In a hydraulic brake, the combination an outer rotary element ofjan inner relatively stationary element: said elements being normal j ly arranged concentric to each otherand separatedby'a fiuidspac, andapistonand oil. ducts contained; within the relatively stationary element'whereby it may be shifted by hydraulic. pressure to aneccentric relationship to the ro tary element for braking purposes. 7 1

s 3. In a hydraulic brake, the combination 7 V with an outer rotary element; of an inner relatively" stationary element normallyarranged concentric to the outer rotary .element, .a stationary blockpl contained within 'the aforesaid relatively star" tionary element, saidinner element bein g'slld-r able in relation' to' the outenrotary element for braking purposes, hydraulically operated means j 4 carried by'the block for shifting theinner ele iment to eccentric position relativeto the uter element by fluid derived from thespacebetween carried by the block for shifting the inner element to eccentric position relative to the outer element by fluid derived from the space between the inner and outer elements, means carried by the block for restoring the inner element to normal position, and fluid by-pass means for the block and for the inner element, said by-pass means communicating with the fluid space between the inner and outer elements.

HENRY E. DAYVOLT. 

